1. What is the full name of 16Mn carbon steel seamless pipe?
Answer: 16Mn carbon steel seamless pipe is also called Q345B seamless pipe (in Chinese standard). It is a low alloy high-strength carbon steel pipe with a manganese content of about 1.2%-1.6%, which can improve the strength and toughness of the pipe.
2. What are the common outer diameter specifications of carbon steel seamless pipes?
Answer: The common outer diameter (OD) specifications range from 10mm to 630mm. For ordinary grades, the common specifications are 15mm, 20mm, 25mm, 32mm, etc.; for high-specification grades, larger outer diameters (such as 108mm, 159mm, 219mm) are more common.
3. What is the wall thickness range of carbon steel seamless pipes?
Answer: The wall thickness (WT) ranges from 1.5mm to 60mm. Ordinary grades are mostly used for thin-walled pipes (1.5mm-10mm), while high-specification grades (such as 45#, 16Mn) are often used for thick-walled pipes (10mm-60mm) to bear higher pressure.
4. What is the difference between hot-rolled and cold-drawn carbon steel seamless pipes?
Answer: Hot-rolled seamless pipes are made by heating the billet to a high temperature and rolling, with large outer diameter and wall thickness tolerance, suitable for general industrial use; cold-drawn seamless pipes are processed at room temperature, with high precision, smooth surface, and suitable for occasions with high requirements on size and surface quality.
5. Can 20# carbon steel seamless pipe be welded?
Answer: Yes. 20# carbon steel is low carbon steel with good weldability. It can be welded by arc welding, gas welding and other methods without preheating (under normal conditions), and the welding quality is stable.
